Estimate critical loads before a storm
Backup power planning starts with a short list of devices that must keep working: phones, medical equipment, refrigerator, weather radio, router, lights, fans, sump pump, or small appliances. The calculator helps users think about running watts, starting watts, runtime, and whether a portable power station or generator is a better fit for the situation. The result is a planning estimate, not a replacement for electrician guidance or manufacturer specifications.
Compare generator and battery options
Battery stations are quieter and can be used indoors when designed for that purpose, while fuel generators can support larger loads but must be operated outdoors with carbon monoxide safety in mind. Use the live tool to compare assumptions, then verify the final equipment choice with local rules, weather exposure, extension cord safety, transfer switch requirements, and medical needs.
Related emergency pages
- Tornado checklist generator - prepare the full household plan.
- Emergency kit builder - organize water, food, medicine, and supplies.
- Earthquake safety planner - review escape and damage assumptions.
- Cosmo Wise tool hub - browse all utility tools.